Adjusting device for telescopes.



T. A. FIDJELAND ADJUSTING DEVICE FOR TELESGOPBS.

APPLICATION FILED JUNE s, 1913.

1,086,037. v' PaentedFeb.s,1914.

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TERJE AANENSEN FIDJELAND, OF FASTVED'JLIVELAND, CHRISTIANSAND, NORWAY.

ADJUSTING- DEVICE FOR TELESCOPES.

To all whom t may concern.-

Be it known that I, TERJE AANENSEN FIDJELAND, gunmaker, subject ofNorway, residing at Fastvedt, Iveland pr. Christiansand, Norway, haveinvented new and useful Improvements in Adjusting Devices forTelescopes, of which the following is a speciication.

Telescopes are adjusted to different eyes usually by an adjustment ofthe eye-piece in a longitudinal direction of the telescope. infield-glasses or other hand-glasses this sort of adjustment is not feltas any remarkable drawback. Otherwise is the case as to aiming-telescopefor guns. In this connection it is highly important that all movableparts are incased so that most possibly the outer parts remain firmlyfast on the object in question and in relation to each other, for allsuch outer movable parts may in the field vfrequently be subjected toalter their position or be injured, whereas the risk thereof is ofcourse considerably less as regards the parts or organs that may beconsidered as a compact mass. Consequently telescopes of the usualconstruction, z'. c. with a variable length, must be considered as beingless suitable as aiming devices for guns.

The present invention has for its object to provide a telescope of sucha construction that vit has ixedly arranged eyepiece and object-glassand may nevertheless be readily and safely adjusted to different eyes.

Theinvention is illustrated in the accompanying drawing, in which:

Figure l is an outside view of the telescope, and Fig. 2 is a portion ofthe same partly in longitudinal section. Fig. 8 shows the lower half ofFig. 2 seen from the underside and drawn to a larger scale, and Fig. 4is a cross section on the plane I-I in Fig. 3.

As shown in Fig. 1 the telescope is provided 'with a long outer tube -1-and a short tube -2- screwed upon its end (Fig.

2), which parts are firmly connected with each other and may, ifnecessary, belocked together by a set screw or the like. The drawingshows by way of example a handre-arm aiming-telescope with eyepiece at-3- and object-glass at -4-. Eyepiece as well as obj ect-glass,respectively the compound lenses or lens systems for same, are lirmlylocated in the tube, -1, 2-, so

Specification of Letters Patent.

Application filed .Tune 6, 1913.

Patented Feb. 3, 1914.

Serial No. 772,068.

that the same obtains an invariable length. But in accordance with thepresent invention the inner reversing lens h5 (or compound lens orsystem) is adjustable, and it is this partthat enables the adjustment ofthe telescope to different eyes. For this purpose the lens -5- is -ixedin a tube --6, inserted comparatively narrowly in the tube -1 in such amanner that it may be displaced wit-hin the latter by almechanism to bemanipulated from the outside.

As vshown in Fig. 2 the lens tube '-6- is provided at its lower end witha side aperture 7, into which projects a tooth or rib `8- on a metalpiece -9- inserted with a free space in an opening 10% in the telescopetube `1 and provided at its outer side with thread portions-llcorresponding to the inwardly cut threads on a sleeve -12- turnablearound the tube `1--. (see Fig. l) and is prevented from being displacedlongitudinally by abutting against a collar -'-13- on the outside oftube -1- and against the end edge of tube -2- as clearly shown in Figs.2 and 3.

lVhen the sleeve 12- which is not movable longitudinally is rotated onthe tube -l;-, it will force the piece -9- and through its tooth 8 thetube -6- with lens #5- to move in the tube -llongitudinally,` wherebythe necessary adjustment of the lenses takes place.

Hereby is obtained an adjusting device which has only inwardly movableparts the sleeve 12- alone being rotatable and lying Hush with the tube-1- and -2-, so that it'can not cause drawbacks of the kind mentioned inthe preamble. Further it is seen, that the parts, in case of revision orrepairs, cleaning, etc., may be easily separated. For this purpose it isonly required that the tube 2.- be screwed ofi', thereafter the sleevel2- be screwed ott and then the pieceV -9 may be taken out of theapertures -7, 10,- and finally the tube -6- is pulled out by putting aAinger into a side-hole 14.- (Fig. 2) in the said tube.

The arrangement of parts described may be advantageously employed notonly in aiming-telescopes but in the whole in any telescope in which itis important to prevent a variation of the length of the telescope tube.

Having now described my invention,

what I claim as new and desire to secure by Letters Patent is:

l. In telescopes, in Combination, a main tube, an object glass and aneyepiece fiXedly supported in said tube, a movable tube positionedWithin said mainY tube, a reversing lens supported thereby, a rotatablesleeve surrounding said main tube, and means operatively engaging saidsleeve and adapted to be moved longitudinally of said outer tube whensaid sleeve is rotated, said means being operatively connected to saidmovable tube, whereby said movable tube Will be moved relatively to saidmain tube by the rotation of said sleeve.

2. In telescopes, in combination, a main tube, an object glass and aneyepiece fiXedly supported in said tube, a movable tube positionedWithin said main tube, a reversing lens supported thereby, a rotatablesleeve surrounding said main tube, the inner surtace of said sleevebeing threaded, said main tube being provided With an aperturepositioned under said sleeve and a member Within said aperture adaptedto move longitudinally With respect to said main tube, said member beingprovided with portions of threads engaging the threads ou said sleeveand with a portion engaging said movable tube, whereby'rotation of saidsleeve Will move said movable tube relatively to said main tube.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing Witnesses.

TERJE AANENSEN FIDJELAND.

liitnesses JOHAN ALLUM SCHWARTZ, FEDER T. BIRKELAND.

Copies of 'this patent may be obtained for five cents each, byaddressing the "Commissioner of Patents. Washington` ID. C.

